Extreme Networks switch: ARP poisoning / spoofing detected
By Sai Kiran Pandrala · reviewed by Sai Kiran Pandrala, Editor Last verified: 2026-05-30
| Vendor | Extreme Networks |
|---|---|
| Operating system | EXOS / Switch Engine / VOSS |
| Category | IP / Network Issue |
| Skill level | Intermediate to advanced |
| DIY-able? | Yes with CLI access; some scenarios need Extreme GTAC + RMA. |
What this guide covers
Fix ARP poisoning / spoofing detected on a Extreme Networks switch.
Step-by-step
- Identify the offending source MAC via debug or capture.
- Enable DHCP snooping + Dynamic ARP Inspection on access VLANs.
- Mark uplinks as trusted; untrusted ports rate-limit + validate.
- Monitor inspection statistics for repeat attacks.
CLI / commands
show ports info
show ports 1 description
show slot
When the issue persists
- Open a Extreme GTAC case with the tech-support bundle.
- Provide the timeline + recent changes.
Frequently asked questions
Will this work on my specific EXOS / Switch Engine / VOSS version?
The procedure reflects current EXOS / Switch Engine / VOSS behaviour. Older releases may need minor syntax adjustments: use the CLI help (? or tab-completion) to verify.
Should I open a Extreme GTAC case immediately?
Open one if you suspect hardware failure or the symptom persists after a maintenance-window reload. Make sure your support entitlement is active first.
Where can I find the Extreme Networks official documentation?
https://extremeportal.force.com/ExtrArticleLanding, search the product family + feature name.
Is this procedure safe in production?
Test in a lab or maintenance window first. Capture pre-change state so you can roll back.
Related guides
Related fixes
Related guides worth a look while you sort this one out:
- Extreme Networks switch: asymmetric routing detected
- Extreme Networks switch: duplicate IP address detected
- Best Extreme Networks switch for branch office
- Best Extreme Networks switch for enterprise data centre
- Best Extreme Networks switch for retail store
- Best Extreme Networks switch for SD-WAN deployment
References
- Extreme Networks support portal: https://www.extremenetworks.com/support/
- Extreme Networks knowledge base: https://extremeportal.force.com/ExtrArticleLanding
- Extreme Networks security advisories: https://www.extremenetworks.com/support/policies/product-security
- Open a case: https://extr.co/3ZxQDt9
Reference material, not professional advice. Validate against your specific EXOS / Switch Engine / VOSS version and test in a non-production environment before applying.
What changed recently?
Fault diagnosis on a Extreme device goes faster when you map the symptom to a recent change:
- Did firmware update in the last 7 days?
- Did the network (router, ISP, VPN) change?
- Was the device moved physically?
- Did paired devices (phone, hub, app) update?
- Were any accessories swapped in or out?
The answer narrows the root cause to a manageable subset.
Safety + preconditions
Before any work on a Extreme device:
- Unplug from mains for any internal-access procedure.
- Discharge stored energy (capacitors in PSUs, residual battery charge) per manufacturer guidance.
- Use ESD-safe handling for boards and modules. no carpet, no wool sleeves.
- Avoid moisture; never apply liquids near vents or connectors.
- If you smell smoke, see scorch marks, or feel uneven heat, stop and escalate.
How to confirm it's actually fixed
On a Extreme device, the test is rarely "reboot and see". Use this list:
- Active reproduction: trigger the original failure path on purpose.
- Indirect reproduction: do an activity that would expose the same subsystem.
- Status indicator review: every LED / display / app status should be green.
- 24-hour soak: leave the device under normal load overnight; check the next morning.
- Telemetry check: review the device or app's diagnostic log for new error entries.
Escalation guide
For a Extreme device, the right escalation depends on impact:
- Cosmetic / minor: log a ticket via the Extreme app or web portal. Response 1-3 business days.
- Mid-impact: phone support. Have your serial number ready.
- Critical (production down, safety issue): in-person dealer / TAC visit. Bring proof of purchase.
- Out of warranty: third-party repair shop with manufacturer-certified technicians.
More frequently asked questions
Are there safer alternatives for non-technical users?
Yes, the manufacturer's self-service troubleshooter (HP Smart, LG ThinQ, Samsung Members, similar) usually walks through the same steps in a guided UI. Use that first if you're not comfortable with menu paths.
What if my model isn't exactly the same revision?
Cross-check the model code on the rating plate against the manufacturer support page. Major firmware generations sometimes shift the menu path; the option is usually under a similarly-named section.
Will the procedure work on the international variant?
Some features and firmware paths are region-locked. Check the model spec sheet to confirm your variant supports the menu option referenced. If you're outside the US/EU, look for the regional support portal.
How often should I run preventive checks?
Quarterly for most consumer devices; monthly for production / commercial devices. Set a calendar reminder so the device stays healthy between issues.
Will this void my warranty?
Applying official firmware updates and following the user manual will not affect warranty. Opening sealed components, jumping safety circuits, or using third-party parts can void warranty in most jurisdictions.